I tried to install this mod on two different computers, one of them has a fully new windows installed on it, only vanilla minecraft, fabrik and fabrik API (0.37.2+1.17) is installed before identity. Minecraft crashes immediately on startup, it is not crashing without the identity mod. The log:
[15:09:10] [main/INFO]: Loading for game Minecraft 1.17.1
[15:09:11] [main/INFO]: [FabricLoader] Loading 53 mods:
- [email protected]
- [email protected]+1.17
- [email protected]+a02b446318
- [email protected]+2b5c62d018
- [email protected]+c345aea818
- [email protected]+a02b446318
- [email protected]+5ab9934c18
- [email protected]+92519afa18
- [email protected]+a02b446318
- [email protected]+2e8bd82f18
- [email protected]+be9da31018
- [email protected]+6cefd57718
- [email protected]+a02b446318
- [email protected]+a722d8c018
- [email protected]+92519afa18
- [email protected]+6cefd57718
- [email protected]+a02b446318
- [email protected]+b7ab612118
- [email protected]+a02b446318
- [email protected]+36b77c3e18
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+92519afa18
- [email protected]+a02b446318
- [email protected]+2e8bd82f18
- [email protected]+a02b446318
- [email protected]+92519afa18
- [email protected]+b7ab612118
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+e2961fee18
- [email protected]+5f02c96918
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+92519afa18
- [email protected]+2e8bd82f18
- [email protected]+a00e834b18
- [email protected]+155f865c18
- [email protected]+a02b446318
- [email protected]+5ab9934c18
- [email protected]+a02b446318
- [email protected]+a02b446318
- [email protected]+b7ab612118
- [email protected]+3fe3c3f518
- [email protected]
- [email protected]
- [email protected]
- java@16
- [email protected]
- [email protected]
- [email protected]
[15:09:11] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.2 Source=file:/C:/Users/imews/AppData/Roaming/.minecraft/libraries/net/fabricmc/sponge-mixin/0.9.4+mixin.0.8.2/sponge-mixin-0.9.4+mixin.0.8.2.jar Service=Knot/Fabric Env=CLIENT
[15:09:11] [main/INFO]: Compatibility level set to JAVA_16
[15:09:15] [main/WARN]: @mixin target net/minecraft/class_2474$class_5124 is public in fabric-tag-extensions-v0.mixins.json:MixinObjectBuilder and should be specified in value
[15:09:20] [main/WARN]: Error loading class: dev/onyxstudios/cca/api/v3/component/ComponentKey (java.lang.ClassNotFoundException: dev/onyxstudios/cca/api/v3/component/ComponentKey)

You're running 1.16.5 Identity on 1.17. Updating to the current 1.17 version or the upcoming 1.15.0 beta will fix your problem :)

Thanks!